Product of the first n 3-almost primes, divided by product of the first n primes, rounded down.

Terms

a(0) =4a(1) =16a(2) =57a(3) =164a(4) =403a(5) =870a(6) =1535a(7) =3393a(8) =6492a(9) =10075a(10) =16250a(11) =22837a(12) =35092a(13) =53862a(14) =77929a(15) =102925a(16) =130837a(17) =163010a(18) =189773a(19) =245903a(20) =330117a(21) =413691a(22) =508391a(23) =599788a(24) =680172a(25) =767719a(26) =864615a(27) =945420a(28) =1075524a(29) =1189739